Leo (Greek: Λέων Στυππῆς; died 12 January 1143) was Ecumenical Patriarch of Constantinople from May 1134 until his death on 12 January 1143. He was a presbyter at Hagia Sophia before his ascension. He reigned uneventfully during the rule of Byzantine emperor John II Komnenos.

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Eastern Orthodox Church titles
Preceded byJohn IXEcumenical Patriarch of Constantinople 1134 – 1143Succeeded byMichael II